Peripheral nerve conduction in Miller Fisher syndrome.

Two cases of acute ophthalmoplegia, ataxia, and arreflexia with high CSF protein are reported (Miller Fisher syndrome). Detailed EMG and nerve conduction studies showed abnormal conduction in peripheral sensory fibres from the initial stages of the illness in both patients. Careful review up to 10 months after the onset was required to document the sensory conduction abnormality properly in one of them. The electrical findings did not differ from those that can be seen in the Guillain-Barré syndrome and provided no clues as to the mechanism of the ataxia.